Antonov in Agreement with Geely for 6-Speed Automatic Transmission
28 November 2006
Antonov 6-speed. |
Antonov has signed a Heads of Agreement for a Production Licence with Zhejiang Geely Automobile Gearbox Co., the transmission manufacturing subsidiary of Geely Automotive one of China’s leading vehicle manufacturers. The licence covers the production of the Antonov TX6 six-speed automatic transmission.
The Antonov Board emphasized that a production licence agreement has not yet been signed; but “certain stockholder speculation” prompted the announcement, according to the company.
Under the terms of the proposed production licence agreement, Antonov and Geely will work closely together in order to develop the TX6 to production to meet Geely’s production timetable for its own vehicles and to make the transmission available to other vehicle makers worldwide.
Antonov created the six-speed automatic in 2003. The transmission features a combination of planetary gears and parallel transfers of power—the engine’s output is transferred to two parallel three-speed modules. Each of these can independently accept power and transfer it to the differential.
Two simple planetary gears, two brakes and one clutch in each module produce three speeds. Using the friction elements the transmission can select up-shifts and down-shifts in any combination. Each shift is produced with only two friction elements, one engaging and one disengaging simultaneously. Reverse is also provided in one module.
The transmission is very flexible, it can produce any overall ratio and any steps between any of the speeds. When power is transmitted, only one of the planetary gears is carrying torque. The speed of the two modules is slightly reduced with respect to engine speed. There are two direct drives on 4th and 5th speed, and there are no freewheels in the design offering the potential for higher efficiency.
One of the wet brakes in one of the modules is the start device, enabling effective calibration of launch with low thermal loading of the friction elements. It also enables the torque converter to be eliminated, reducing cost, weight and size while improving efficiency. The system is modular and four, five, six or more speeds versions can be chosen to suit a particular cost and application requirement.
Under the terms of the proposed production licence agreement, Antonov will receive both Licence Fees and production royalties.
Geely have already taken two models of conventional automatic transmission to production and the Antonov TX6 will be an addition to this model line-up.
" The transmission is very flexible, it can produce any overall ratio and any steps between any of the speeds."
If it can really produce ANY overall ratio, then it would be like a CVT; that could select the optimal ratio for a given driving condition.
I do not see how it can produce ANY overall ratio.
Posted by: Jorge | 28 November 2006 at 07:26 AM
"... The transmission is very flexible, it can produce any overall ratio and any steps between any of the speeds. ..." This quote indeed seems vague and ambiguous; but it is an exact quote from Antonov's site. URL to Antonov site follows: [ http://www.antonov-transmission.com/aad.htm ].
As the company is French, and the inventor is Bulgarian, maybe something was lost in the translation. Can someone here more cleary explain this claim?
Posted by: Pete_P | 28 November 2006 at 03:54 PM
If I'm parsing their web site correctly, this is functionally similar to the step-by-step dual clutch transmission VW markets as DSG, which features 6 forward and one reverse gear.
In both designs, there are two wet clutches and no torque converter (which means no torque gain near 50% slip, so the engine has to work a little harder to get the car moving in 1st gear). The next higher gear is pre-selected on the other (non-torque bearing) prior to the rapid automates cut-over from one clutch to the other. An extreme kick-down sequence would be straight from 5th to 2nd in the Antonov case and from 6th to 5th to 2nd in VW's.
Using planetary gears gives the Antonov design the advantage of a higher engine torque limit(more gear teeth bearing load), at the expense of greater complexity. However, the step-by-step design with wet clutches works well enough in the 300-600Nm maximum torque range, e.g. beefy diesels. Step-by-step dual clutch designs rated up to 250Nm are also available with dry friction clutches, but so far they've been too expensive for the European market where manuals rule in the A-C/D vehicle segments.
To some extent, it looks as if Antonov may have been working around the patents covering the VW design.
Posted by: Rafael Seidl | 28 November 2006 at 05:02 PM
Indeed looks like VW DSG, only with planetary gears.
And wow, four planetary gearsets, two wet clutches, four brakes. Compare with GM/DC/BMW two-mode hybrid transmission with three planetary gearsets (one is power-split unit), two brakes, two electric motors (smaller then in Toyota Synergy drive), and no clutches at all. With two pure mechanical gear points, infinitely variable ratio in between, start-stop, regenerative braking, pure electrical mode, electric power assist, 100% towing capability – the hybrid one seems to be better use of quite expensive planetary mechanics.
Posted by: Andrey | 29 November 2006 at 02:02 AM
http://www.antonov-clubsite.nl/000000962f000d411/000000987d111fa03/index.html
Posted by: Ron | 17 February 2007 at 10:44 AM